RE: Break-in a rebuilt engine?
Dave:
Of course a chromed bore is honed to size at the factory. They use very special hard fine grit stones to do it. While plating can be controlled tightly, the control isn't that tight, and the finish sizing is definitely done with a hone. But it's seldom more than a small fraction of a thousandth inch.
I'll admit I sometines give a chromed bore a light touch, but only when it has vertical scores. All I'm trying to do is be certain there is no upset metal at the sides of the scores. The original hatching pattern is still there, as you said, no more needs be done if there's no scoring.
Bill.